| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Rhizorhagium antarcticum (Hickson & Gravely, 1907) |
Antarctic Indian Ocean | ||
| Rhizorhagium formosum (Fewkes, 1889) |
Eastern Pacific | ||
| Rhizorhagium roseum Sars, 1874 |
Creeping orange hydroid | Atlantic Ocean, Eastern Pacific and the Arctic |